Download Radiation Dosimetry Instrumentation and Methods by CRC Press PDF

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These were interpolated onto the fine matrix and used to modify the dose calculation from the conventional algorithm. The method was tested in a worst-case example where large dose gradients were present and in a clinically relevant irradiation geometry. It is shown that the time required for the generation of a 3D matrix with superposition can be reduced by at least a factor of 100 with no significant loss in accuracy. 5 cm in all dimensions) as a product of the mass attenuation coefficient and the energy fluence at each depth.

In the second step, the Bragg-Gray equation is used to determine the absorbed dose to water at the effective point of measurement, P eff , from the mean absorbed dose to air D air, Q . fm Page 32 Friday, November 10, 2000 10:50 AM 32 Radiation Dosimetry: Instrumentation and Methods detector is introduced in the medium, all of them given at the user’s beam quality Q. When an ionization chamber has independent calibration factors both in terms of air kerma N K (or exposure N x ) and in terms of absorbed dose to water N w at the same reference beam quality Q 0 , it is possible to obtain a relationship between both calibration factors.

Fm Page 27 Friday, November 10, 2000 10:50 AM Theoretical Aspects of Radiation Dosimetry 27 perturbation factor applicable to the particular ionization chamber in an electron beam at a mean energy E z at depth e ( E ) values for the Markus chamber are z ref, w . 2816E z ) It is generally recommended that water phantoms should be used wherever possible for the experimental procedures involved in the absolute calibration of electron beams. However, it is recognized that in certain situations, particularly for lower-energy electron beams and the use of parallel-plate chambers, it may be more convenient to use solid plastic phantoms.

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